According to a TechCrunch report, visiting the profile page of an infected user can lead to one's own profile getting infected. The worm also apparently sends spam tweets from the infected person's account that direct others to the StalkDaily site.

The worm apparently hit in the morning, according to Twitter, and then had a resurgence in the afternoon.

StalkDaily's site states that it has nothing to do with the attacks, according to TechCrunch. But that statement apparently is being taken with a grain of salt.